Cyclohexenone derivatives and their use for controlling undesirable plant growth

Abstract

Cyclohexenone derivatives of the formula ##STR1## where R 1 is alkyl, R 2 is alkyl, unsubstituted or halogen-substituted alkenyl or alkynyl, X is a substituted or unsubstituted five-membered heteroaromatic radical, and Z is hydrogen, methoxycarbonyl, ethoxycarbonyl, methyl or cyano, processes for their manufacture, and the use of these compounds for controlling undesirable plant growth.

We claim: 
     
       1. A cyclohexenone compound of the formula ##STR7## where R 1  is ethyl or n-propyl, R 2  is ethyl or --CH 2  --CH--CH 2 , X is isoxazol-5-yl substituted by 3-methyl and Z is hydrogen and agriculturally suitable salts thereof. 
     
     
       2. A herbicidal composition containing inert additives and a cyclohexenone compound of the formula I as set forth in claim 1, or a salt thereof. 
     
     
       3. A herbicidal composition as set forth in claim 1, containing from 0.1 to 95 wt % of a cyclohexenone compound of the formula I. 
     
     
       4. A process for combatting weeds, wherein the weeds or the area to be kept free from weeds are treated with a herbicidally effective amount of a cyclohexenone compound of the formula I as set forth in claim 1, or a salt thereof. 
     
     
       5. A process as set forth in claim 1, wherein the amount of cyclohexenone compound of the formula I is from 0.025 to 3 kg/ha. 
     
     
       6. The cyclohexenone compound of the formula I of claim 1, wherein R 1  is n--C 3  H 7 , R 2  is CH 2  CH═CH 2 , X is 3-methyl-isoxazol-5-yl and Z is H. 
     
     
       7. A cyclohexenone compound of the formula ##STR8## where R 1  is alkyl of 1 to 4 carbon atoms, R 2  is alkyl of 1 to 4 carbon atoms, unsubstituted or halogen substituted alkenyl of 3 to 5 carbon atoms or alkynyl of 3 to 5 carbon atoms, X is 3-phenylisoxazol-5-yl and Z is hydrogen, methoxycarbonyl, ethoxycarbonyl, methyl or cyano and agriculturally suitable salts thereof. 
     
     
       8. A cyclohexenone of the formula I as set forth in claim 7, where R 1  is n-propyl, R 2  is ethyl, and Z is hydrogen. 
     
     
       9. A herbicidal composition containing inert additives and a cyclohexenone compound of the formula I as set forth in claim 7, or a salt thereof. 
     
     
       10. A herbicidal composition as set forth in claim 9, containing from 0.1 to 95 wt % of a cyclohexenone compound of the formula I. 
     
     
       11. A process for combatting weeds, wherein the weeds or the area to be kept free from weeds are treated with a herbicidally effective amount of a cyclohexenone compound of the formula I as set forth in claim 7, or a salt thereof. 
     
     
       12. A process as set forth in claim 11, wherein the amount of cyclohexenone compound of the formula I is from 0.025 to 3 kg/ha.